opening e-mail attactments

I have windows-7. I am having trouble opening attactments that I get with my e-mails. When I click on the attactment, I am asked if I want to open or save the attactment. I click on open. Then I am asked if I want to allow the sender of attatment to change anything on my computer. Since I know who the sender is I click on Yes. Then I am told the following "adobe Type Manager was not found." How do I get my computer to find the "adobe Type
Manager?